Novels for grown-ups by authors better known for their children's books

1.
The Blue Castle
The Blue Castle 4.31 avg rating — 52,511 ratings
2.
The Summer Book
The Summer Book 4.01 avg rating — 50,785 ratings
2.
Two People
Two People 3.63 avg rating — 320 ratings
4.
Till We Have Faces: A Myth Retold
Till We Have Faces: A Myth Retold 4.20 avg rating — 77,512 ratings
5.
I Capture the Castle
I Capture the Castle 3.99 avg rating — 113,025 ratings
6.
Saplings
Saplings 3.92 avg rating — 907 ratings
7.
The Making of a Marchioness
The Making of a Marchioness 3.67 avg rating — 4,700 ratings
8.
Switch Bitch
Switch Bitch 3.93 avg rating — 10,591 ratings
9.
Wifey
Wifey 3.40 avg rating — 17,080 ratings
10.
The Screwtape Letters
The Screwtape Letters 4.27 avg rating — 499,617 ratings
11.
Austenland (Austenland, #1)
Austenland (Austenland, #1) 3.56 avg rating — 90,445 ratings
12.
The Casual Vacancy
The Casual Vacancy 3.31 avg rating — 335,327 ratings
13.
The Good Man Jesus and the Scoundrel Christ
The Good Man Jesus and the Scoundrel Christ 3.43 avg rating — 14,460 ratings
14.
The L-Shaped Room (Jane Graham, #1)
The L-Shaped Room (Jane Graham, #1) 3.96 avg rating — 3,536 ratings
15.
The Red House Mystery
The Red House Mystery 3.68 avg rating — 14,036 ratings
15.
A Fair Barbarian
A Fair Barbarian 3.59 avg rating — 306 ratings
17.
Family Roundabout
Family Roundabout 4.17 avg rating — 356 ratings
18.
The Incomplete Amorist
The Incomplete Amorist
by: E. Nesbit
3.33 avg rating — 85 ratings
19.
A Long Fatal Love Chase
A Long Fatal Love Chase 3.68 avg rating — 7,199 ratings
20.
In This House of Brede
In This House of Brede 4.36 avg rating — 6,624 ratings
20.
It Ends with Revelations
It Ends with Revelations 3.19 avg rating — 428 ratings
22.
A Severed Wasp
A Severed Wasp 4.02 avg rating — 3,540 ratings
23.
The Town in Bloom
The Town in Bloom 3.60 avg rating — 797 ratings
24.
The Seven Lady Godivas
The Seven Lady Godivas
by: Dr. Seuss
3.68 avg rating — 952 ratings
24.
The Face in the Frost
The Face in the Frost 3.80 avg rating — 2,434 ratings
26.
The Lark
The Lark
by: E. Nesbit
3.80 avg rating — 1,060 ratings
26.
Lilith
Lilith 3.88 avg rating — 7,164 ratings
28.
The True Deceiver
The True Deceiver 3.82 avg rating — 7,210 ratings
29.
Robin
Robin 3.57 avg rating — 168 ratings
29.
A Candle for St. Jude
A Candle for St. Jude 3.78 avg rating — 230 ratings
31.
Black Narcissus
Black Narcissus 3.82 avg rating — 3,227 ratings
32.
The Whicharts
The Whicharts 3.60 avg rating — 132 ratings
32.
Deep Secret
Deep Secret 4.10 avg rating — 6,746 ratings
32.
A Breath of Air
A Breath of Air 3.54 avg rating — 87 ratings
35.
The Winter is Past
The Winter is Past 3.99 avg rating — 166 ratings
35.
Chloe Marr
Chloe Marr 3.32 avg rating — 34 ratings
35.
Kingfishers Catch Fire
Kingfishers Catch Fire 3.93 avg rating — 589 ratings
38.
The Girl From The Candle-Lit Bath
The Girl From The Candle-Lit Bath 3.44 avg rating — 32 ratings
38.
Breakfast with the Nikolides
Breakfast with the Nikolides 3.62 avg rating — 387 ratings
40.
Sister Anne Resigns
Sister Anne Resigns 3.27 avg rating — 11 ratings
40.
The Actor and the Housewife
The Actor and the Housewife 3.15 avg rating — 9,522 ratings
40.
Thursday's Children
Thursday's Children 4.28 avg rating — 655 ratings
43.
Summer Sisters
Summer Sisters 3.86 avg rating — 126,013 ratings
43.
Phantastes
Phantastes 3.90 avg rating — 12,267 ratings
43.
Indian Dust
Indian Dust 3.57 avg rating — 23 ratings
46.
Cromartie V. the God Shiva: Acting Through the Government of India
Cromartie V. the God Shiva: Acting Through the Government of India 3.24 avg rating — 182 ratings
47.
The Ice House
The Ice House 3.42 avg rating — 142 ratings
47.
Pippa Passes
Pippa Passes 3.15 avg rating — 177 ratings
49.
The River
The River 3.97 avg rating — 946 ratings
50.
The Battle of the Villa Fiorita
The Battle of the Villa Fiorita 3.90 avg rating — 785 ratings
51.
The New Moon with the Old
The New Moon with the Old 3.63 avg rating — 854 ratings
51.
China Court: The Hours of a Country House
China Court: The Hours of a Country House 3.98 avg rating — 1,405 ratings
53.
A Tale of Two Families
A Tale of Two Families 3.49 avg rating — 438 ratings
53.
The Peacock Spring
The Peacock Spring 3.92 avg rating — 859 ratings
55.
Five for Sorrow, Ten for Joy
Five for Sorrow, Ten for Joy 4.20 avg rating — 1,433 ratings