Catch and Keep by Erin Hahn

After turning down her boyfriend's marriage proposal, Maren escapes to the northwoods of Wisconsin, where she's inherited a rundown bait shop. The bait shop was owned by Fost, who Maren spent many summers fishing with. While there, Maren develops an attraction for Joe, who was her older brother Liam's best friend. Joe, in turn, also has feelings for Maren--but his life is complicated. He's divorced, with two young children--Anders and Lucy. Maren, however, loves both Anders and Lucy, and they feel the same way about her. Now Maren and Joe need to get Liam to realize that Maren is a responsible adult, not just his kid sister. Catch and Keep is the last book in the trilogy that Hahn has written about Maren and her two best friends, Shelby and Lorelei.